| Title |
Topological charge pumping with subwavelength Raman lattices / |
| Authors |
Burba, Domantas ; Račiūnas, Mantas ; Spielman, I. B ; Juzeliūnas, Gediminas |
| DOI |
10.1103/PhysRevA.107.023309 |
| Full Text |
|
| Is Part of |
Physical review A.. American Physical Society. 2023, vol. 107, iss. 2, art. no. 023309, p. [1-11].. ISSN 2469-9926. eISSN 2469-9934 |
| Abstract [eng] |
Recent experiments demonstrated deeply subwavelength lattices using atoms with N internal states Raman coupled with lasers of wavelength λ. The resulting unit cell was λ/2N in extent, an N-fold reduction compared to the usual λ/2 periodicity of an optical lattice. For resonant Raman coupling, this lattice consists of N independent sinusoidal potentials (with period λ/2) displaced by λ/2N from each other. We show that detuning from Raman resonance induces tunneling between these potentials. Temporally modulating the detuning couples the s and p bands of the potentials, creating a pair of coupled subwavelength Rice-Mele chains. This operates as a topological charge pump that counterintuitively can give half the displacement per pump cycle of each individual Rice-Mele chain separately. We analytically describe this behavior in terms of infinite-system Chern numbers and numerically identify the associated finite-system edge states. |
| Published |
American Physical Society |
| Type |
Journal article |
| Language |
English |
| Publication date |
2023 |
| CC license |
|
